名词

1. 里程碑;重大事件;重要阶段
A milestone is an important event in the history or development of something or someone.

2. （路边显示到某地距离的）里程碑，里程标志
A milestone is a stone by the side of a road showing the distances to particular places.

1. stone post at side of a road to show distances

Synonym: milepost

2. a significant event in your life (or in a project)